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172 Technical Information
Specifications
Item English Metric
Drive train
Clutch type Wet, multi-plate type
Transmission 5-speed, constant mesh
Primary reduction 2.357
Gear ratio I 2.133
Gear ratio II 1.706
Gear ratio III 1.421
Gear ratio IV 1.211
Gear ratio V 1.043
Final reduction
CRF450RX: 3.846
CRF450R: 3.769
Gear shift pattern
Left foot-operated return
system 1-N-2-3-4-5
Electrical
Battery
HY85S lithium-ion (li-ion)
12V-2.0 Ah (20HR)
Ignition ECM
Starting system Electric
Spark plug NGK
Standard SILMAR9A-9S
For extended high
speed riding
NGK
SILMAR10A-9S
Spark plug gap
0.031 – 0.035 in
(0.8 – 0.9 mm)
Fuse
Main fuse 10 A
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